Improvement in grinding and separating mills



'2 SheetsSheet 1. @D. C. EBAUGH. GRINDING AND SEPARATING MILLS. N 135O89 Patented Dec. 5, I876.

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GRINDING AND SEPARATING MILLS. I No.185,089. Patented Dec. 51876WITNESSES Algal Z 4 J smizflwv ATTORNEY THE GRAPHIC CDJLY STATES,

PATENT OFFIC.

DAVID C. EBAUGH, OF CHARLESTON, SOUTH CAROLINA, ASSIGNOR TO HIMSELF ANDATLANTIC PHOSPHATE COMPANY, OF SAME PLACE.

IMPROVEMENT IN GRINDING AND SEPARATING MILLS.

Specification forming part of Letters Patent No. 1 85,089, datedDecember 5, 1876; application filed September 23, 1876.

To all whom it may concern:

Be it known that I, DAVID O. EBAUGH, of Charleston, in the county ofCharleston and State of South Carolina, have invented certain new anduseful Improvements in Pulverizing and Separating Mills; and I do herebydeclare that the following is a full, clear, and

exact description thereof, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon, which formpart of this specification.

The nature of my invention consists in the construction and arrangementof a combined pulverizing mill and separator, as will be hereinaftermore fully set forth.

In order to enable others skilled inthe art to which my inventionappertains to make and use the same, I will now proceed to de scribe itsconstruction and operation, referring to the annexed drawing, in which-Figure l is a longitudinal vertical section of my machine. Fig. 2. is anend elevation of the same, and Fig. 3 is a section of a (letached partthereof.

A represents a suitable frame-work, supporting the lower or bed stone B.O is the upper or running stone, supported upon the upper end of theshaft D, said shaft passing through a bushing, a, in the eye of thelower stone B, and the lower end supported in a step, b, on anadjustable bridge-tree, E. Onv the lower portion of the shaft D issecured a bevel-piniom'G, which meshes with a bevelwheel, G on a shaft,G and this shaft is provided with a suitable band-pulley for receivingthe power to run the mill. H is the millstonehoop, on top of which is a;frame supporting the hopper I. To the hoop H is attached a flexiblesleeve, 01, which extends down into the eye of the stone C, for thepurpose of diminishing leakage of air between the top of the hoop andthe top of the stone. Under the hopper is suspended a swiveled orpivoted conductor, J, for conveying and feeding the material to thestones. K represents a trough for conveying the material from the millthrougha fan, L, into a series of boxes,

I? P, arranged in regular succession.

In operation, it will be seen that as the fan L puts the'air in motion,a draft of air will be caused between the stones, which will blow thefine dust and small particles through the trough K over the boxes P, thelarger or heavier particles falling into the first boxes and the finergrades being carried farther along, and thereby assorted. At the extremeend of the trough K I propose, in a full-sized machine, to use adust-chamber made of canvas, to allow the air to pass, but retain thedust.

I thus supply an ordinary grinding-mill with an exhaust-fan orwtcuum-pump to create a draft between the furrows of the stones, so asto aid the discharge of the material ground, and at the same tiine keepa current of air passing between the stones, which will tend to coolthem, and enable them to be driven faster than they could be run withoutthe draft.

The object of this invention is to facilitate the grinding and preventthe usual wear in a great measure, and also to utilize the air put inmotion .by the fan to convey and separate the pulverized material intodifferent boxes, arranged so that the different grades of fineness canbe obtained without passing it through sieves.

Having thus fnlly described my invention,

, what I claim as new, and desire to secure by Letters Patent, is-

In a grinding and pulverizing mill, the com- V bination of the trough K,provided with a series of open-top boxes, arranged one after the other,with the fan L interposed between the trough and the exit from theinillstones, whereby the different grades of material are automaticallycarried into the boxes, substan-, tially as set forth.

In testimony that I claim the foregoing as my own I atfix my signaturein presence of two witnesses.

D. O. EBAUGH.

Witnesses:

WILLIAM L. BRAMHALL, G. L. Evnnr.

